Furnace



C. G. MILLER ma. z5, 1930.

FURNAGE Filed April 4, 1928 2 sheets-,snaai 1 IHVEPITOR Carl G. Hiller ATTORNEY /Ilm\ I I 5| I I I I I l I C. G. MILLER Feb. 25, 1930.

FURNAGE Filed April 4, 1928 2 Sheets--ShecnI 2 IHVEHTOR Carl Cr. Tiller 5,- currents.

Patented Feb. 25, 1930 PATENT OFFICE CARL G. MILLER, oFivIoUNT cLEMENs, MICHIGAN FURNACE Application led April 4, 1928. Serial No. 267,156.

This. invention relates to a furnace, and has to do more particularly with a furnace ofthe type which effects heating by the heat ing of air and the setting upy of convection The invention can be embodied in ay hot'air furnace 'commonly placed in the basement of ya residence with the hot air conducted through pipes to the rooms to be heated, ory the-invention can beembodied in a so-called parlor furnace or stove. y

'lhefinvention has as an object the provision ofra heater of `theftype mentioned which is constructed so as to accelerate the heating action, especiallywhen there is a newly built fire or the intensity of the fire n increased. The slowness'offthe heatingef on line rl-fl'of Fig. 2.

fect infurna'ces of this nature is particularly noticeable where the furnace is in the base4 ment as it takes quite a while before the conl vection currents start moving to any appie ciable extent. Alsothe invention aims to provideafurnace simple yin construction and which can be easily cleaned of soot', and for this purpose theconstruction, contemplates a simple'v arrangement which functions'both tofspeed 'up initial heating action and to col lect'soot;y f 4 l l More specifically, the invention contemplatesthe use of tubes in close proximity to the re box. These tubes are for the purpose of the passage `of air therethrough so 'that convection currents are set up. It is appreciated that the kuse ofair tubes of this nature is not new, and in fact are` shown in a number of` patents, but the vpresent invention makes use of additional'elements which in combinationfwith the tubes, obtains new and better results.`

1 In the accompanying drawings:

Fig. l is VaV sectional view taken through the furnace, the section being taken from the front to the rear of the furnace substantially Fig.v 2 yis a sectional viewtaken substantiallyon line2-'2 of Fig. l'.

Fig. y3 is a horizontal section on, line 3-3 of Fig. 2 illustrating the manner in which the soot collecting member may be removed.

Fig. 4 is a fragmentary front view of the furnace.

Fig. 5 is a detail of a modified manner in which the air tubes can be mounted in the furnace. v

The furnace includes an outer shell 1 having a cold air inlet 2, and may be provided with a plurality of hot air outlets to which conduits may be attached for conducting the hot air to rooms to be heated. The cold air inlet may be connected to the outsideof the building, or it may take air from the lower part of the rooms to which the hotair is conducted thus setting up a circulation of air. The drawings depict the invention as em,- bodied in the type of furnace usually placedv in a basement, but the principles of theinvention described below can be equally well embodied in the so-called parlor furnace without deviating from the invention.

lVithin the outer shell is a heating unit 5` spacedfrom'the outer shell so as to provide an air heating space 4, this being the customary air heating space ofthe hot air furnace. The heater unit includesthe lire box 6 to which access may be had through a fuel feed door 7. A suitable grate 8 is provided, below which is an ashpot'9. A suitable draft dooris represented at l0, and at ll there is a pivoted en closure for lan opening through which a tool will be noted that the walls ofthe fire box,

asillustrated in Figs. l and 2, practically meet the edges of the grate without thewinterposition of a shoulder or ring. c This construction. materially facilitates the shaking of ashes out ofthe fire box inasmuch as there is no ledge or shoulder around the edges of the fire box where clinkers or the like may collect.

Above the fire box, the inner heating unit is 'provided with a drum l5 within vwhich are confined the flame of the fire and products of combustion, and this drum may advantageously be of boiler iron'or'sheet steel. As will be noted, the drum is larger than the fire box. Extending vertically through the drum and positioned around the lire vbox are a plurality of pipes 16 which are open at both the lower and upper ends. The lower ends preferably extend down bel-ow the drum and in fairly close proximity to the bottom of` the furnace. These pipes canl be placed in the drum in any desirable manner, and one way consists of providing on the pipesy a shoulder 17, which maybe a ring clamped thereto, and then screw threading a ring 18 at the upper end. By screwing the rings down tight the drum ends are clamped between the ltwo-rings .and smoke-tight joints er relative humidity of the heated air, a water pipe22 may extend through the casing 1 and arrange ytoY drip water into the pan 23 fixed to the top of the smoke hood.

At a point near the upper ends'of the airv pipes and above the fire box, there is placed a'l deilector for the products of combustion, and this deflector also functions to collect soot. This-deiiector may take the form of 'a metal plate 25, and for the purpose of supporting this plate, a pairy of rods 26 may be placed lacross the drum. Attention is Vcalled to the fact that this plate' is of such a sizer as to nicely fit in between the air pipes so that the products of combustion coming up from the fire box are deflected by the plate and caused to flowoutwardly in three directions in contact with the air pipes 'near the upper ends thereof.- In other words, viewingFig. 2, the products of combustion are deflected outwardly into the space 27 .surrounding the air pipes, whereupon the products of'combustion return back over the plate 25 before enteringA the smoke pipe.

; Thus it willbe seen combustion arey caused to comeA into Contact with the upper ends of the pipesso that the Vair at this point is subjected to intensive heat. The-air at the bottom of the pipes, however,

is not subjectedto such a degree of heat and accordingly remains cooler. As a result, there is practically immediate movement of the air through 'the tubes. Thiais-'especially true when the yfire is built or when a low fire vis increased in intensity. 1,

Another important feature is the fact that the products of combustion pass outwardly around the sides of the deflector plate and theninwardly above thedeflector plate. lllhe speed of movement above the deflector plate is diminished somewhat, and also thereis a Y change in the-direction of movement, and thisresults 1n a material depositzof soot on the deflector plate. For the purpose of 'clean-l ing the furnace, a clean-out dooris provided immediately at the front of this deilector plate. When the door is open, as illustrated in Fig. 4, the soot can be raked out the of the door opening with a suitable tool; or, onkthe that thefprolducts ofy otherV hand, the plate may be removed entirely by being drawn forwardly vthrough the door opening, as illustrated in Fig. 3,' and the soot can be removed after the plate is removed, whereupon 1t can be inserted again vinthe furnace.

It is thought that the airV tubes should be Y protected near the fire box so that they will not be damaged if lumps of coaly are thrown Y into the furnace and strike the pipes, or if the Vfire inthe lire box is 4permitted to pileY Y In the claims appended hereto, reference is made to a furnace; thislis-fdonefor the' Y purpose of brevity, and it is to be understood that this term is used with the intention that it beconstrued to cover heaters other thany soY furnaces, for example, stoves or parlor typey heaters. y y

Claims :v `j l. A hot air furnace or the Vlike comprising, an outer shell, an inner heating unit spaced from the outer shell to provide an air heat-t ing space, said heating unit including-a lire.

box and a drum above the fire box, said drum having horizontal dimensions greater than the fire box, a plurality of tubes extending vertically through the ends of the` drum so as to surround `the fire box, said tubes extendlng downwardly into close, proximity of the ion bottom of the air heating space, and com-` municating with the said air heating spacev above the drum, means within the drum for deile'ctmg theproducts of combustion to `the ends of the drum vbetween the said air pipes,

said means .being positioned near the uppery end of the drum whereby the upper ends of vthe. said pipes arerelatively quickly heated f to thus set up, practically immediately, air; i

cenvectioncurrents, andmeans at the top of thefouter shell for conducting the .convection currents for heatingfpurposes, saidy deflector beingV in the form of a plate removably held withinfthe heater unit, and the furnacebeing provided with an -opening insubstantial alignment therewith whereby the plate maybe removed for the removaljof soot there- ,y

from. I Y y 2. A hot air'furn'ace comprising,an outer shell, a fire box, a-drum positioned above the fire box, said' drum having horizontal dimensions greater than the fire box,-a1plurality of vertically disposed air conduits extending through the drum, asmoke'hood connected substantially centrally with the top of the drum, a combined baffle member and soot collector disposed between 'the fire boxj and the smoke hood, said memberk having dimensions so as to substantially fit the area bounded by the vertical airconduits, wherebyrth'e f (products of combustion are caused to pass to l through the drum, a smoke hood connected i sions so as to substantially fit the area boundy substantially centrally with the top of the drum, a combined battle member and soot collector disposed between the re box and the smoke hood, said member having dimened by the vertical air conduits, whereby the products of combustion are caused to pass to the outer walls of the drum between the spaced air conduits andV back between the spaced conduits `over the baliie member to the smoke hood, a pair of rods extending across the ydrum for slidably supporting the said baIie member, and a closure in the outer shell substantially vertical alignment with the rods through which the said baiie member 'may be withdrawn.

In testimony whereof I a'x my signature.

` CARL G. MILLER, 

